Filter统一处理字符集

最新推荐文章于 2020-01-09 22:35:41 发布

hugui123456ccc

最新推荐文章于 2020-01-09 22:35:41 发布

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分类专栏： jsp 文章标签： Servlet Java XML Web

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本文介绍了一个用于统一处理HTTP请求字符集的Java Filter实现。通过配置文件指定字符集（如GB18030），该Filter会在请求到达业务逻辑之前设置正确的字符集编码，确保系统能够正确解析各种客户端发来的请求数据。

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import java.io.IOException;

import javax.servlet.Filter;
import javax.servlet.FilterChain;
import javax.servlet.FilterConfig;
import javax.servlet.ServletException;
import javax.servlet.ServletRequest;
import javax.servlet.ServletResponse;

/**
 * 采用Filter统一处理字符集
 * @author Administrator
 *
 */
public class CharsetEncodingFilter implements Filter {

	private String encoding = "GB18030";

	public void destroy() {
	}

	public void doFilter(ServletRequest servletRequest, ServletResponse servletResponse,
			FilterChain filterChain) throws IOException, ServletException {
		//设置字符集
		servletRequest.setCharacterEncoding(encoding);
		filterChain.doFilter(servletRequest, servletResponse);
	}

	public void init(FilterConfig filterConfig) throws ServletException {
		encoding = filterConfig.getInitParameter("encoding");
	}
}

<?xml version="1.0" encoding="UTF-8"?>
<web-app version="2.4" 
	xmlns="http://java.sun.com/xml/ns/j2ee" 
	xmlns:xsi="http://www.w3.org/2001/XMLSchema-instance" 
	xsi:schemaLocation="http://java.sun.com/xml/ns/j2ee 
	http://java.sun.com/xml/ns/j2ee/web-app_2_4.xsd">

  <filter>
  	<filter-name>CharsetEncodingFilter</filter-name>
  	<filter-class>com.bjpowernode.drp.CharsetEncodingFilter</filter-class>
  	<init-param>
  		<param-name>encoding</param-name>
  		<param-value>GB18030</param-value>
  	</init-param>
  </filter>

  <filter-mapping>
  	<filter-name>CharsetEncodingFilter</filter-name>
  	<url-pattern>*.do</url-pattern>
  </filter-mapping>
</web-app>